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# Drug calculation tutorial_091407

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### Drug calculation tutorial_091407

1. 1. 1 Drug Calculation Tutorial By Monica Major-Harris, RN, BSNLab Assistant, Simulated Learning Center for Health Sciences Southern Illinois University Edwardsville School of Nursing September 14, 2007
2. 2. 2 Drug Calculation TutorialBasic Math Review • One MUST know this acronym: Please Excuse My Dear Aunt Sally PEMDAS - This acronym stands for the order of operation in which math calculations must be solved (Parentheses, Exponents, Multiplication, Division, Addition, and then Subtraction) If not performed in this order, the answer will be wrong. • Fractions can be converted into a whole number (with or without decimals) by dividing the numerator (top #) by the denominator (bottom #). • To multiply fractions, first multiply all the numerators, then multiply all the denominators. The final step is to reduce the final fraction down the lowest number which is done by dividing the numerator by the denominator. (Keep in mind you are staying on the top of the line all of the way across and on the bottom of the line all of the way across) • Percentages refer to parts per 100. For example, 3% is equal to 3 parts out of 100. It can be written as a fraction which in turn can be converted into a decimal or whole number by dividing by 100. For example: 3% = 3 parts out of 100 = 3 = 0.03 100 • Ratios are proportions or fractions just written in a different format. In a ratio, the first number is the numerator, and the second number is the denominator. Instead of using a line with the numerator on the top and the denominator on the bottom, the numerator and the denominator are separated by a colon (:). For example, 1 : 2 = 1 part per 2 parts = 1 2 which can then be turned into a fraction by dividing 1 by 2 = 0.5 and then into a percentage by moving the decimal point two places to the right = 50%. • A decimal can be converted to a fraction by dividing by 1.